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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *
4 * Generic part shared by ipv4 and ipv6 backends.
5 */
6
7#include <linux/kernel.h>
8#include <linux/init.h>
9#include <linux/module.h>
10#include <linux/netlink.h>
11#include <linux/netfilter.h>
12#include <linux/netfilter/nf_tables.h>
13#include <net/netfilter/nf_tables_core.h>
14#include <net/netfilter/nf_tables.h>
15#include <net/netfilter/nft_fib.h>
16
17const struct nla_policy nft_fib_policy[NFTA_FIB_MAX + 1] = {
18 [NFTA_FIB_DREG] = { .type = NLA_U32 },
19 [NFTA_FIB_RESULT] = { .type = NLA_U32 },
20 [NFTA_FIB_FLAGS] = { .type = NLA_U32 },
21};
22EXPORT_SYMBOL(nft_fib_policy);
23
24#define NFTA_FIB_F_ALL (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR | \
25 NFTA_FIB_F_MARK | NFTA_FIB_F_IIF | NFTA_FIB_F_OIF | \
26 NFTA_FIB_F_PRESENT)
27
28int nft_fib_validate(const struct nft_ctx *ctx, const struct nft_expr *expr,
29 const struct nft_data **data)
30{
31 const struct nft_fib *priv = nft_expr_priv(expr);
32 unsigned int hooks;
33
34 switch (priv->result) {
35 case NFT_FIB_RESULT_OIF:
36 case NFT_FIB_RESULT_OIFNAME:
37 hooks = (1 << NF_INET_PRE_ROUTING);
38 break;
39 case NFT_FIB_RESULT_ADDRTYPE:
40 if (priv->flags & NFTA_FIB_F_IIF)
41 hooks = (1 << NF_INET_PRE_ROUTING) |
42 (1 << NF_INET_LOCAL_IN) |
43 (1 << NF_INET_FORWARD);
44 else if (priv->flags & NFTA_FIB_F_OIF)
45 hooks = (1 << NF_INET_LOCAL_OUT) |
46 (1 << NF_INET_POST_ROUTING) |
47 (1 << NF_INET_FORWARD);
48 else
49 hooks = (1 << NF_INET_LOCAL_IN) |
50 (1 << NF_INET_LOCAL_OUT) |
51 (1 << NF_INET_FORWARD) |
52 (1 << NF_INET_PRE_ROUTING) |
53 (1 << NF_INET_POST_ROUTING);
54
55 break;
56 default:
57 return -EINVAL;
58 }
59
60 return nft_chain_validate_hooks(ctx->chain, hooks);
61}
62EXPORT_SYMBOL_GPL(nft_fib_validate);
63
64int nft_fib_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
65 const struct nlattr * const tb[])
66{
67 struct nft_fib *priv = nft_expr_priv(expr);
68 unsigned int len;
69 int err;
70
71 if (!tb[NFTA_FIB_DREG] || !tb[NFTA_FIB_RESULT] || !tb[NFTA_FIB_FLAGS])
72 return -EINVAL;
73
74 priv->flags = ntohl(nla_get_be32(tb[NFTA_FIB_FLAGS]));
75
76 if (priv->flags == 0 || (priv->flags & ~NFTA_FIB_F_ALL))
77 return -EINVAL;
78
79 if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) ==
80 (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR))
81 return -EINVAL;
82 if ((priv->flags & (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF)) ==
83 (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF))
84 return -EINVAL;
85 if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) == 0)
86 return -EINVAL;
87
88 priv->result = ntohl(nla_get_be32(tb[NFTA_FIB_RESULT]));
89
90 switch (priv->result) {
91 case NFT_FIB_RESULT_OIF:
92 if (priv->flags & NFTA_FIB_F_OIF)
93 return -EINVAL;
94 len = sizeof(int);
95 break;
96 case NFT_FIB_RESULT_OIFNAME:
97 if (priv->flags & NFTA_FIB_F_OIF)
98 return -EINVAL;
99 len = IFNAMSIZ;
100 break;
101 case NFT_FIB_RESULT_ADDRTYPE:
102 len = sizeof(u32);
103 break;
104 default:
105 return -EINVAL;
106 }
107
108 err = nft_parse_register_store(ctx, tb[NFTA_FIB_DREG], &priv->dreg,
109 NULL, NFT_DATA_VALUE, len);
110 if (err < 0)
111 return err;
112
113 return 0;
114}
115EXPORT_SYMBOL_GPL(nft_fib_init);
116
117int nft_fib_dump(struct sk_buff *skb, const struct nft_expr *expr)
118{
119 const struct nft_fib *priv = nft_expr_priv(expr);
120
121 if (nft_dump_register(skb, NFTA_FIB_DREG, priv->dreg))
122 return -1;
123
124 if (nla_put_be32(skb, NFTA_FIB_RESULT, htonl(priv->result)))
125 return -1;
126
127 if (nla_put_be32(skb, NFTA_FIB_FLAGS, htonl(priv->flags)))
128 return -1;
129
130 return 0;
131}
132EXPORT_SYMBOL_GPL(nft_fib_dump);
133
134void nft_fib_store_result(void *reg, const struct nft_fib *priv,
135 const struct net_device *dev)
136{
137 u32 *dreg = reg;
138 int index;
139
140 switch (priv->result) {
141 case NFT_FIB_RESULT_OIF:
142 index = dev ? dev->ifindex : 0;
143 *dreg = (priv->flags & NFTA_FIB_F_PRESENT) ? !!index : index;
144 break;
145 case NFT_FIB_RESULT_OIFNAME:
146 if (priv->flags & NFTA_FIB_F_PRESENT)
147 *dreg = !!dev;
148 else
149 strncpy(reg, dev ? dev->name : "", IFNAMSIZ);
150 break;
151 default:
152 WARN_ON_ONCE(1);
153 *dreg = 0;
154 break;
155 }
156}
157EXPORT_SYMBOL_GPL(nft_fib_store_result);
158
159MODULE_LICENSE("GPL");
160MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *
4 * Generic part shared by ipv4 and ipv6 backends.
5 */
6
7#include <linux/kernel.h>
8#include <linux/init.h>
9#include <linux/module.h>
10#include <linux/netlink.h>
11#include <linux/netfilter.h>
12#include <linux/netfilter/nf_tables.h>
13#include <net/netfilter/nf_tables_core.h>
14#include <net/netfilter/nf_tables.h>
15#include <net/netfilter/nft_fib.h>
16
17const struct nla_policy nft_fib_policy[NFTA_FIB_MAX + 1] = {
18 [NFTA_FIB_DREG] = { .type = NLA_U32 },
19 [NFTA_FIB_RESULT] = { .type = NLA_U32 },
20 [NFTA_FIB_FLAGS] = { .type = NLA_U32 },
21};
22EXPORT_SYMBOL(nft_fib_policy);
23
24#define NFTA_FIB_F_ALL (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR | \
25 NFTA_FIB_F_MARK | NFTA_FIB_F_IIF | NFTA_FIB_F_OIF | \
26 NFTA_FIB_F_PRESENT)
27
28int nft_fib_validate(const struct nft_ctx *ctx, const struct nft_expr *expr,
29 const struct nft_data **data)
30{
31 const struct nft_fib *priv = nft_expr_priv(expr);
32 unsigned int hooks;
33
34 switch (priv->result) {
35 case NFT_FIB_RESULT_OIF:
36 case NFT_FIB_RESULT_OIFNAME:
37 hooks = (1 << NF_INET_PRE_ROUTING);
38 if (priv->flags & NFTA_FIB_F_IIF) {
39 hooks |= (1 << NF_INET_LOCAL_IN) |
40 (1 << NF_INET_FORWARD);
41 }
42 break;
43 case NFT_FIB_RESULT_ADDRTYPE:
44 if (priv->flags & NFTA_FIB_F_IIF)
45 hooks = (1 << NF_INET_PRE_ROUTING) |
46 (1 << NF_INET_LOCAL_IN) |
47 (1 << NF_INET_FORWARD);
48 else if (priv->flags & NFTA_FIB_F_OIF)
49 hooks = (1 << NF_INET_LOCAL_OUT) |
50 (1 << NF_INET_POST_ROUTING) |
51 (1 << NF_INET_FORWARD);
52 else
53 hooks = (1 << NF_INET_LOCAL_IN) |
54 (1 << NF_INET_LOCAL_OUT) |
55 (1 << NF_INET_FORWARD) |
56 (1 << NF_INET_PRE_ROUTING) |
57 (1 << NF_INET_POST_ROUTING);
58
59 break;
60 default:
61 return -EINVAL;
62 }
63
64 return nft_chain_validate_hooks(ctx->chain, hooks);
65}
66EXPORT_SYMBOL_GPL(nft_fib_validate);
67
68int nft_fib_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
69 const struct nlattr * const tb[])
70{
71 struct nft_fib *priv = nft_expr_priv(expr);
72 unsigned int len;
73 int err;
74
75 if (!tb[NFTA_FIB_DREG] || !tb[NFTA_FIB_RESULT] || !tb[NFTA_FIB_FLAGS])
76 return -EINVAL;
77
78 priv->flags = ntohl(nla_get_be32(tb[NFTA_FIB_FLAGS]));
79
80 if (priv->flags == 0 || (priv->flags & ~NFTA_FIB_F_ALL))
81 return -EINVAL;
82
83 if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) ==
84 (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR))
85 return -EINVAL;
86 if ((priv->flags & (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF)) ==
87 (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF))
88 return -EINVAL;
89 if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) == 0)
90 return -EINVAL;
91
92 priv->result = ntohl(nla_get_be32(tb[NFTA_FIB_RESULT]));
93
94 switch (priv->result) {
95 case NFT_FIB_RESULT_OIF:
96 if (priv->flags & NFTA_FIB_F_OIF)
97 return -EINVAL;
98 len = sizeof(int);
99 break;
100 case NFT_FIB_RESULT_OIFNAME:
101 if (priv->flags & NFTA_FIB_F_OIF)
102 return -EINVAL;
103 len = IFNAMSIZ;
104 break;
105 case NFT_FIB_RESULT_ADDRTYPE:
106 len = sizeof(u32);
107 break;
108 default:
109 return -EINVAL;
110 }
111
112 err = nft_parse_register_store(ctx, tb[NFTA_FIB_DREG], &priv->dreg,
113 NULL, NFT_DATA_VALUE, len);
114 if (err < 0)
115 return err;
116
117 return 0;
118}
119EXPORT_SYMBOL_GPL(nft_fib_init);
120
121int nft_fib_dump(struct sk_buff *skb, const struct nft_expr *expr, bool reset)
122{
123 const struct nft_fib *priv = nft_expr_priv(expr);
124
125 if (nft_dump_register(skb, NFTA_FIB_DREG, priv->dreg))
126 return -1;
127
128 if (nla_put_be32(skb, NFTA_FIB_RESULT, htonl(priv->result)))
129 return -1;
130
131 if (nla_put_be32(skb, NFTA_FIB_FLAGS, htonl(priv->flags)))
132 return -1;
133
134 return 0;
135}
136EXPORT_SYMBOL_GPL(nft_fib_dump);
137
138void nft_fib_store_result(void *reg, const struct nft_fib *priv,
139 const struct net_device *dev)
140{
141 u32 *dreg = reg;
142 int index;
143
144 switch (priv->result) {
145 case NFT_FIB_RESULT_OIF:
146 index = dev ? dev->ifindex : 0;
147 *dreg = (priv->flags & NFTA_FIB_F_PRESENT) ? !!index : index;
148 break;
149 case NFT_FIB_RESULT_OIFNAME:
150 if (priv->flags & NFTA_FIB_F_PRESENT)
151 *dreg = !!dev;
152 else
153 strncpy(reg, dev ? dev->name : "", IFNAMSIZ);
154 break;
155 default:
156 WARN_ON_ONCE(1);
157 *dreg = 0;
158 break;
159 }
160}
161EXPORT_SYMBOL_GPL(nft_fib_store_result);
162
163bool nft_fib_reduce(struct nft_regs_track *track,
164 const struct nft_expr *expr)
165{
166 const struct nft_fib *priv = nft_expr_priv(expr);
167 unsigned int len = NFT_REG32_SIZE;
168 const struct nft_fib *fib;
169
170 switch (priv->result) {
171 case NFT_FIB_RESULT_OIF:
172 break;
173 case NFT_FIB_RESULT_OIFNAME:
174 if (priv->flags & NFTA_FIB_F_PRESENT)
175 len = NFT_REG32_SIZE;
176 else
177 len = IFNAMSIZ;
178 break;
179 case NFT_FIB_RESULT_ADDRTYPE:
180 break;
181 default:
182 WARN_ON_ONCE(1);
183 break;
184 }
185
186 if (!nft_reg_track_cmp(track, expr, priv->dreg)) {
187 nft_reg_track_update(track, expr, priv->dreg, len);
188 return false;
189 }
190
191 fib = nft_expr_priv(track->regs[priv->dreg].selector);
192 if (priv->result != fib->result ||
193 priv->flags != fib->flags) {
194 nft_reg_track_update(track, expr, priv->dreg, len);
195 return false;
196 }
197
198 if (!track->regs[priv->dreg].bitwise)
199 return true;
200
201 return false;
202}
203EXPORT_SYMBOL_GPL(nft_fib_reduce);
204
205MODULE_LICENSE("GPL");
206MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");